NJU7631
Step-Down Switching Regulator IC with Power Saving PWM/PFM control
■ GENERAL DESCRIPTION
The NJU7631 is a low ...
NJU7631
Step-Down Switching
Regulator IC with Power Saving PWM/PFM control
■ GENERAL DESCRIPTION
The NJU7631 is a low voltage operation high-speed switching
regulator control IC for step-down converter, with PWM/PFM switching control. It can improve a switching efficiency on light load with automatically changing between PWM and PFM controls. It incorporates a totem pole output, which can drive an external MOS-FET easily. The NJU7631 also has a soft-start function, dead time control and timer latch for short circuit protection and their times are all adjustable with external parts. It is available in a small and thin 8-lead MSOP (TVSP) package.
■ PACKAGE OUTLINE
NJU7631RB1 (MSOP8 (TVSP8))
■ FEATURES
■ PRODUCT VARIATION
● Automatic PWM/PFM Control
● Operating Voltage
2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
NJU763x**
Standby Function PWM/PFM
● Maximum Duty Cycle 100%
● Quiescent Current
800µA typ.
● Soft-Start Function
Internal : 16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology
● Package Outline
NJU7631RB1 : MSOP8 (TVSP8)*
NJU7631
PWM/PFM Light Load to Efficiency
NJU7630
PWM Control
** Planning
*MEET JEDEC MO-187-DA / THIN TYPE
■ PIN CONFIGURATION
1 2 3 4
NJU7631RB1
8 7 6 5
PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN 5. SCP 6. DTC 7. RT 8. GND
Ver.2012-08-03
-1-
NJU7631
■ BLOCK DIAGRAM
FB
IN1V Vref
V+ ER⋅AMP
Soft Start
Latch
UVLO
SCP 1V
2µA SCP
2kΩ 1V
0.5 RT
A
DTC
OSC 0.5V
RT ...